Grover /Trophy Musical Products was founded in 1922 as a wholesaler of musical instruments and accessories under the name Grossman Music Corporation. We started manufacturing in the 1940s and eventually leave the wholesale business to focus on manufacturing. We are best known for our full range of Grover® guitar tuning buttons, including the popular Rotomatic series for guitars as well as tuning keys for bass, mandolins, banjos and ukuleles; as well as bridges, cables, Ultra CapoTM and other fret string accessories.